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Dilute Bose-Einstein condensate with large scattering length | | Eric Braaten
; H-W Hammer
; Thomas Mehen
; | | Date: |
28 Jan 2002 | | Journal: | Phys Rev Lett, 88 (4), 040401 | | Abstract: | We study a dilute Bose gas of atoms whose scattering length a is large compared to the range of their interaction. We calculate the energy density E of a homogeneous Bose-Einstein condensate (BEC) to second order in the low-density expansion, expressing it in terms of a and a second parameter Lambda* that determines the low-energy observables in the three-body sector. The second-order correction to E has a small imaginary part that reflects the instability due to three-body recombination. In the case of a trapped BEC with large negative a, we calculate the coefficient of the three-body mean-field term in E in terms of a and Lambda*. It can be very large if there is an Efimov state near threshold. | | Source: | PubMed, pmid11801094 | | Services: | Forum | Review | Favorites | |
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